特集：東京工芸大学「私立大学研究ブランディング事業」第二回「色」の科学・芸術に関する国際シンポジウム
A Fundamental Study on the Effect of Pigment Use Amount on the Color of Colored Mortar
2020 年 83 巻 2 号 p. 120-121
詳細
2020 年 83 巻 2 号 p. 120-121
Focusing on the mortar portion, which is considered to determine the color of concrete, experimental verification was conducted on the effect of the amount of pigment used on the color of colored mortar. In the preliminary experiment, the color of the mixed powder of cement and pigment constituting the cement paste appearing on the surface layer of the mortar was measured. As a result, it was found that the region in which the color of the mixed powder effectively changes as the pigment substitution rate increases or decreases is in the range where the pigment substitution rate relative to the cement mass is lower than 5% to 10%. Further, in the range where the pigment substitution rate relative to the cement mass is lower than 5%, a clear change appears in the L*a*b* values of the mortar as the pigment use amount is increased or decreased. As the pigment substitution rate increased, the L* value decreased and the a*b* value approached the pigment color. However, since mortar with the low pigment substitution rate of 1.25% can be clearly confirmed visually to be blue, green, or yellow, relatively inexpensive colored mortar is considered to be usable, taking into account the optimum use method, including the factor of cost.
